/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.flowable.bpmn.converter.parser;

import javax.xml.stream.XMLStreamReader;

import org.apache.commons.lang3.StringUtils;
import org.flowable.bpmn.constants.BpmnXMLConstants;
import org.flowable.bpmn.converter.util.BpmnXMLUtil;
import org.flowable.bpmn.model.BpmnModel;
import org.flowable.bpmn.model.Message;

/**
 * @author Tijs Rademakers
 */
public class MessageParser implements BpmnXMLConstants {

    public void parse(XMLStreamReader xtr, BpmnModel model) throws Exception {
        if (StringUtils.isNotEmpty(xtr.getAttributeValue(null, ATTRIBUTE_ID))) {
            String messageId = xtr.getAttributeValue(null, ATTRIBUTE_ID);
            String messageName = xtr.getAttributeValue(null, ATTRIBUTE_NAME);
            String itemRef = parseItemRef(xtr.getAttributeValue(null, ATTRIBUTE_ITEM_REF), model);
            Message message = new Message(messageId, messageName, itemRef);
            BpmnXMLUtil.addXMLLocation(message, xtr);
            BpmnXMLUtil.parseChildElements(ELEMENT_MESSAGE, message, xtr, model);
            model.addMessage(message);
        }
    }

    protected String parseItemRef(String itemRef, BpmnModel model) {
        String result = null;
        if (StringUtils.isNotEmpty(itemRef)) {
            int indexOfP = itemRef.indexOf(':');
            if (indexOfP != -1) {
                String prefix = itemRef.substring(0, indexOfP);
                String resolvedNamespace = model.getNamespace(prefix);
                result = resolvedNamespace + ":" + itemRef.substring(indexOfP + 1);
            } else {
                result = itemRef;
            }
        }
        return result;
    }
}
